Chain saw



FIG. 1 is a perspective view of the chain saw of the present invention;

FIG. 2 is a left side view of the design of the present invention;

FIG. 3 is a right side view of the design of the present invention;

FIG. 4 is a top view of the design of the present invention;

FIG. 5 is a bottom view of the design of the present invention;

FIG. 6 is a rear view of the design of the present invention; and,

FIG. 7 is a front view of the design of the present invention.

The broken lines are for illustrative purposes and to define boundaries between claimed and unclaimed portions of the claimed design and form no part of the claimed design. 

The ornamental design for a chain saw, as shown and described. 